<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >php_stream_read</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="Streams Common API Reference" HREF="streams.common-api.html"><LINK REL="PREVIOUS" TITLE="php_stream_open_wrapper" HREF="streams.php-stream-open-wrapper.html"><LINK REL="NEXT" TITLE="php_stream_write" HREF="streams.php-stream-write.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="streams.php-stream-open-wrapper.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="streams.php-stream-write.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="streams.php-stream-read" ></A >php_stream_read</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN252584" ></A >php_stream_read -- Read a number of bytes from a stream into a buffer</DIV ><DIV CLASS="refsect1" ><A NAME="AEN252587" ></A ><H2 >Description</H2 >size_t <B CLASS="methodname" >php_stream_read</B > ( php_stream * stream, char * buf, size_t count )<BR ></BR ><P > <B CLASS="function" >php_stream_read()</B > reads up to <CODE CLASS="parameter" >count</CODE > bytes of data from <CODE CLASS="parameter" >stream</CODE > and copies them into the buffer <CODE CLASS="parameter" >buf</CODE >. </P ><P > <B CLASS="function" >php_stream_read()</B > returns the number of bytes that were read successfully. There is no distinction between a failed read or an end-of-file condition - use <B CLASS="function" >php_stream_eof()</B > to test for an <TT CLASS="constant" ><B >EOF</B ></TT >. </P ><P > The internal position of the stream is advanced by the number of bytes that were read, so that subsequent reads will continue reading from that point. </P ><P > If less than <CODE CLASS="parameter" >count</CODE > bytes are available to be read, this call will block (or wait) until the required number are available, depending on the blocking status of the stream. By default, a stream is opened in blocking mode. When reading from regular files, the blocking mode will not usually make any difference: when the stream reaches the <TT CLASS="constant" ><B >EOF</B ></TT > <B CLASS="function" >php_stream_read()</B > will return a value less than <CODE CLASS="parameter" >count</CODE >, and 0 on subsequent reads. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="streams.php-stream-open-wrapper.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="streams.php-stream-write.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >php_stream_open_wrapper</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="streams.common-api.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >php_stream_write</TD ></TR ></TABLE ></DIV ></BODY ></HTML >